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Precision Spindle FUKA Series Product Catalog

Precision Spindle FUKA Series Product Catalog

We offer a total of 15 models with belt drive as standard designs tailored for various applications.

This catalog introduces the FUKA series of precision spindles. Starting with the "FKS1201 type," which offers two types of pulley configurations, we also feature the compact "FKS1202 type," designed with installation dimensions in mind, and the high-rigidity "FKS1302(BT50) type," which delivers sufficient performance. The FUKA series includes a total of 15 standard designs tailored for various applications, all driven by belts. [Featured Products] ■ FUKA Precision Spindle ■ FKS1201 Type ■ FKS1202 Type ■ FKS1302(BT50) Type ■ Motor Built-in Type *For more details, please refer to the PDF document or feel free to contact us.

  • shaft

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Spindle rotation accuracy

Spindle rotation accuracy

High-precision spindles achieve improved machining quality, reduced tool wear, and stable operation for long periods!

The rotational accuracy of the spindle is an important indicator that affects the operational stability of the spindle and the machining precision. It is usually measured by the radial and axial runout at the spindle tip or the tooling mounting surface during no-load and low-speed rotation. This accuracy greatly depends on the manufacturing precision of the spindle components and the quality of assembly. 【General Standards for Rotational Accuracy】 ■ Runout at the spindle end face ≦ 1μm ■ Runout of internal taper ≦ 2μm ■ Runout measured with a 300mm test bar ≦ 15μm *For more details, please download the PDF or feel free to contact us.

  • スピンドルの回転精度2.png
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Precision spindle "FKS1201 type"

Precision spindle "FKS1201 type"

Guaranteed high rotational precision! A precision spindle that achieves enhanced waterproofing with a four-layer structure.

The "FKS1201 model" is a precision spindle that is ready for immediate use due to its well-equipped internal features. Depending on the application, you can choose from three types: standard type, high load capacity type, and high rigidity type. All three types have the same mounting dimensions, taking machine design into consideration. Precision angular ball bearings arranged in a four-row (DBB arrangement) configuration ensure high rotational accuracy. 【Features】 ■ All three types have the same mounting dimensions, considering machine design ■ Guarantees high rotational accuracy ■ Mounting direction can be either horizontal or vertical ■ Waterproofing is achieved with a four-layer structure for enhanced waterproofing ■ Well-equipped internal features *For more details, please refer to the PDF document or feel free to contact us.

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Precision spindle "FKS1202 type"

Precision spindle "FKS1202 type"

Well-equipped internal features! A compact type precision spindle designed with installation dimensions in mind.

The "FKS1202 model" is a compact type precision spindle with small mounting dimensions, allowing for flexibility in machine design. It is optimally equipped with four rows of precision angular ball bearings (DBB arrangement), ensuring high rotational accuracy. Additionally, with well-equipped internal features such as flood coolant and air blow, it is ready for immediate use. 【Features】 ■ Compact type ■ Guarantees high rotational accuracy ■ Mounting direction can be horizontal or vertical ■ Waterproof with a four-layer structure, achieving enhanced waterproofing ■ Well-equipped internal features *For more details, please refer to the PDF document or feel free to contact us.

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Temperature rise of the spindle

Temperature rise of the spindle

Understand the heating state of the entire spindle! Significantly improve quality and reliability in long hours of continuous processing.

The temperature rise of the spindle is primarily caused by friction heat from the bearings during high-speed rotation, the agitation of the lubricant, and heat conversion by the motor. Excessive temperature rise can lead to displacement or thermal deformation of the spindle shaft, adversely affecting machining accuracy, surface finish, and tool life. To ensure stable operation of the spindle over long periods and consistency in machining, precise control of temperature rise and thermal compensation mechanisms are extremely important. Generally, the temperature changes at three key positions are monitored: the fixed end of the bearing (T1), the movable end (T2), and the spindle motor (T3). [General Standards for Spindle Temperature Management] ■ Temperature rise at the bearing section ΔT ≦ 20°C ■ Temperature difference between T1 and T2 ≦ 5°C *For more details, please download the PDF or feel free to contact us.

  • スピンドルの温度上昇2.png
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What is spindle rigidity?

What is spindle rigidity?

The formula for stiffness is Stiffness (K) = Applied Force (F) ÷ Displacement (δ). Here are the inspection criteria.

Spindle rigidity refers to the ability to suppress deformation in response to external forces, and is typically expressed in N/μm (Newtons/microns). When spindle rigidity is insufficient, elastic deformation and vibrations are more likely to occur during machining, leading to issues such as reduced dimensional accuracy and deterioration of surface roughness. Furthermore, uneven bearing loads can occur, potentially adversely affecting long-term operational stability. On the other hand, a high-rigidity spindle design improves machining stability, contributes to the reduction of machining errors and tool wear, and can maintain high-precision machining quality over extended periods. 【Rigidity Calculation Formula】 ■K = Rigidity (N/μm) ■F = Applied Force (N) ■δ = Displacement (μm) *For more details, please download the PDF or feel free to contact us.

  • スピンドル剛性とは2.png
  • スピンドル剛性とは3.png
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Calculation of cutting force for spindle torque setting

Calculation of cutting force for spindle torque setting

Properly set the spindle torque required during processing! An explanation of the accurate cutting force calculation method divided into three items.

Introducing "Cutting Force Calculation for Spindle Torque Settings." Cutting force depends on multiple factors such as cutting speed, feed rate (feed amount), tool diameter, and material coefficients. Through calculations, the spindle load during drilling can be understood, allowing for the selection of appropriate torque capacity. Additionally, it is possible to accurately calculate the cutting torque during milling and evaluate the compatibility of spindle torque specifications. 【Calculation Items】 ■ Calculation of cutting speed and feed rate ■ Cutting force and torque for drilling ■ Cutting force and torque for milling *For more details, please download the PDF or feel free to contact us.

  • shaft

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Precision Spindle "FKS1302 Model"

Precision Spindle "FKS1302 Model"

The installation direction can be either horizontal or vertical! Precision spindle for BT50.

The "FKS1302 model" is a high-rigidity type precision spindle that demonstrates sufficient performance for "BT50". With well-equipped internal features such as flood coolant and air blow, it is ready for immediate use. Additionally, it is optimally configured with four rows (DBB arrangement) of precision large angular ball bearings, ensuring high rotational accuracy. 【Features】 ■ High rigidity type ■ Guarantees high rotational accuracy ■ Can be installed in both horizontal and vertical orientations ■ Waterproof with a four-layer structure, achieving enhanced waterproofing ■ Well-equipped internal features *For more details, please refer to the PDF document or feel free to contact us.

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